Pneumatically-fed tool



G. H. GILMAN PNEUMATICALLY FED TOOL Filed Nov. s. i918 ell. li zam06.52015 Ga 1 To all lwhom t may concern:

Patented Dee. 16, 1924.

' UNITED STATES PATENT OFFICE.

GEORGE E. Guam, 40F CLABEICNT, -HAIPSHIRE `ASSIGIN'ORv TO SULLIVANIAOHINEBY COIZPANY, A CORPORATION 0F MASSACHUSETTS.

rNnUmncaLLY-rnn moor..

Application led November 8, 1918. Serial No. 261,686.

Be it known that I, -Gnoncn H. GILMAiT,

a citizen of the United States residing at Claremont, in 'the county ofullivan .and

State of New Hampshire, have invented certain new and usefulImprovements in Pneumatically-Fed Tools, ofwhich the following is afull,` clear, and exact, specification.

This invention relates tov pneumatically fed tools, and moreparticularly to pneumatically fed drills of the type used 1n the frontend1\of or ahead of the feedin mining or uarrying' the rincipal objectof the preseni invention heling to provide a means for supporting thedrilling mechanismon the manner that the apparatus may be used in alimited space, nd that the drilling mechanism is not lia e to change itspositionI angularly relative to the feeding mechanism, but will remainparallel thereto.`

In order to obtain a simple and easily controlled apparatus it has beenthe practice, heretofore, t'o mount the drilling machine on g mechanismand to provide a single member for connecting the machine and mechanism.This construction is not adapted for use in narrow passages or roomsbecause of its great length, and, because of the single connectioncommonly used between the drill and the feeding mechanism, it is diicultto ,aline the two accurately so that the drill ically (feddrillinglullnachine, parts of the feeding and dri g mechanisms beingshown in section.

'Fig. 2 is a fragmentary sectional view through the rear' end of thedrill mounting means showing 'the drill ready for use as a bmi w01.. yIn this illustrative embodiment I have eeding mechanism in such av showna pneumatic'hammer drill comprisin the sleeve of the rotating mechanismand to assist in removin stuck drills. Alarge, ysomewhat tapered sleeve7 encloses the rotating mechanism and 'is rigidly held against the frontcylinder head by suitable clamping means (not necessary to show herein).f

Mounted a back cylinder head 8 is a small water tube 9 which projectscentrally through the piston and rotating mechanism into t with suitablepassages in the cylinder head, and with a pipe 10, to conduct water tothe drill steel, as is common in drilling of this type. A valve (notshown) is usually mounted on the water conductor 10 to oontrol the flowof water to the cutting end of the steel to remove cuttings or chips.

In the form of my improvement shown herein2 I have provided thepneumatic hammer with two spaced su porting members or brackets 11, 12mounte respectively on the head 8 and sleeve-`7, the brackets in thisembodiment being widely spaced so as better e hollow drill'steel, andcooperates machines to provide against a turning movement of p bracketsmay be mounted on the cylinder in such a manner that the head 8 or thesleeve 7 and the operating parts of the pneumatic f hammer may be`easily removed. Such changes 'will be obvious to those skilled in theart, and it is .the intention to include all such modifications withinthe scope of the present invention.

The pneumatic feeding device comprises a cylinder 13, a iston 14, .and apiston id 15 having two ongitudinally ,disposed passages 16, 17 whichcommunicate respectively with the front and back of the piston 14 forthe purpose of conducting pressurevfluid to one or both ends of thispiston or to exhaust the fluid therefrom to move the piston, which inturn moves the pneumatic hammer. For this latter purpose, I haveprovided the piston rod with a reversed end 18, disposed parallel to andpreferably beneath the main part of the piston rod 15. If desired, thisrod may be made in sections which may be bolted or threaded' together,but in the present embodiment the piston rod 15 and the supportingmember 18 are preferably made of a single piece in order to simplifyandstrengthen the construction. l The outer reversed end 18 of the pistonrod 14 I preferably term the hammer support, since it is made to passthrough the brackets 11, 12 and is held in iiXed relation thereto by anut 19 and a split ring washer 20. As is shown bythe dotted lines, theend of the hammer support has a tapered fit in the bracket 11, it beingapparent that by turning the nut 19 on the threaded bolt 21 formed onthe end of the support, the hammer is rigidly secured to said support.Attention is here directed to the fact that the bend 18- in the pistonrod which connects the portions 15 4and 18, and the length of the hammersupport 18 may be so proportioned to the length of the hammer that theforward end ofthe hammer will not project beyond the bend 18 in vthepiston rod and that the bent end and hammer willw project a minimumdistance beyond the -end of the cylinder'l3. By this improvedconstruction the overall length of the apparatus is but slightly greaterthan the length of 'the cylinder 13 and for use in restricted -minepassages the overall length of the apparatus l may be materially reducedby using -a shorter cylinder. It will also be noted that the front endof the hammer is back of the bendin the piston rod, so that when thedrill is fed forward the bent rod will strike a mine wall first and keepthe hammer from -contacting with the wall in case aI steel retainer isnot used, and even if the latter is used, owing to its construction, butlittle shock will be imparted to the drill.

Cooperating with my improved Amecha.- nism just described, I haveprovidedva conical valve 22,- herein shown as mounted in the cylinderhead 8l, which directs'the flow ofV fluid pressure supplied to the endof this valve by a hose 23, vto the ends of -the cylinder 13 tofoperatethe pneumatic feed and to the `cylinder 1 to operate the pneumatichammer. Since the Vvalve structure forms no part of the presentinvention, and since one form which this valve mayassumeis fullydisclosed in my Patent'No. 1,250,933, issued December 18, 1917, the samehas not been disclosed in detail, it being thought lsuflicient for thepresent disclosureito show the ducts 24 bored in the cylinder head 8 andcommunicating with the valve 22 and ducts or passages 16, 17 toconductthe fluid leither end of the that they are well known and correspond fgenerally to the disclosure' of the patent granted me, No. 1,151,261.The rate of feed of the tool can in a well known manner be controlled bythis brake.

In order that this apparatus may be attached` to a support, as a bar ortripod,and in order that the pneumatic cylinder may be advanced towardthe work as the hole is deepened, a clamping device 25 is provided whichmaybe clamped to the cylinder` 13 at cumference without changing theposition of the drill mounting `as a whole. It will furv ther be noticedthat by merely removing the bolt 19 and the split ring 20, it ispossible to remove the motor by sliding it rearwardly oit' of the rod 18and that a motor of different length can be attached thereto in place ofthe motor removed, asthere is ample room on the lower arm'of the pistonrod U to make this possible. I have shown, as will be notedfmytoolprovided .with a handle 27 which makes it possible to employ the tool asa separate hand tool by plugging off the bores 24 by means of a suitableconical plug .which may be inserted in the socket in the Y rear head onremoval of the motor from its' apparatus, a tool, a

mounting therefor comprising a feed cylinder, a piston rod ofsubstantially U-shape with a piston csecured. to one arm of said U andreciprocable in the feed cylinder, and

means for attaching said tool to the other arm' of' said U, said pistonrod constituting the sole means by whichV said tool is supportedrelative to said f eed cylinder.

lll)

2. In a drilling apparatus, a motor, a feed cylinder cooperatingtherewith, a piston in said feed cylinder, a piston rod secured to saidpiston and havinga rebent arm, and means formed at the rear end of saidre-bent portion for attachment to said motor, said piston rodconstituting the sole means by which said tool is supported relative tosaid feed cylinder.

3. In a drilling apparatus, a motor, a feed cylinder cooperatingtherewith, a piston in said feed cylinder, apiston rod secured to saidpiston and having a re-bent. arm, means formed at the rear end of saidre-bent portion for attachment to ,said

motor, .and clamping means provided onha said motor kto cooperate withsaid re-bent portion at a spacially separated point, said plston rodconstituting the sole means by 'which saidtoolis supported relative toisaid feed cylinder..

4. In a drilling V apparatus, the combination including a. motor, afeeding mechanism for said motorcom'prising a cylinder, a pistonreciprocable in said cylinder, a U-shaped piston rod, and means formedon said motor for connecting the same at a plurality of pointsh to thefree arm of Said U, said piston rod constituting the sole means by whichsaid tool is supported relative to said feed I cylinder.

5. In a. drilling apparatus, the combination including a tool, a feedinsaid tool including a feed cylin er, a piston reciprocating therein anda' U-shaped piston rod, one arm of which is secured to said piston andto the other arm of which said tool is attached', said tool beingcapabley of being swung about the longitudinal' axis of said .firstmentioned arm.

6. In a drilling apparatus, a tool comprising a cylinder member, frontand back headV members, and a rotation mechanism containing sleevemember, in combination with a feeding device cooperating therewith 'andhaving a piston rod connected tothe 'rear`head member and to the sleevemembe of the motor. z.

7. In a drilling apparatus, the combin tion including a tool, a f lmechanism for said tool including afee cylinder, a piston reciprocatingtherein, and a U-shaped piston rodcoo rating with said piston, the freearm of w 'ch may be swung about the longitudinal axis of the other arm,and means for mounting said tool on said free arm whereb the forwardendof sa'id tool is substantia y opposite the bend 'of ,said U. 8. In adrilling a paratus, the combina; tion including a too a device formoving the tool including a feed cylinder and piston, and a U-shapedpiston rod cooperating therewith, one end of which is secured to devicefor said position andthe other end ofwhich provides means, of connectionfor said tool at a plurality of ints, one of said connections -being asli able connection, they otherl motor, -and said motor being formed atits front end with means said arm. ,l

10. In an apparatus of the class described, the combination including acylinder, a iston and iston rod associated therewit a pneumatic hammer,and means connected with said piston rod'and projecting rearwardly fromthe front end of thecylinder for supporting the hammer, said rod andmeans constituting 4the sole means by which said tool is supportedrelative to said feed cylinder.

11. In anapparatus of the class described, the combination including apneumatic hammer, a sleeve thereon, a su'pport, a bracket rigidlymounted on said hammer for attachment' to and support, and a secondbracket rigidly mounted on the sleeve but movably mounted on saidsupport.

12. In an .apparatus of the class described, the combination includingfeeding the passages in said rod, and a va ve forv controlling the "ilowof pressure Huid through said assages and to said hammer, said hammerIbein bodily rotatable about the axis of said cy der. v

13. In an. apparatus of the class de scribed, the com ination includingfeeding mechanism comprising a cylinder, a iustonA and a rod .having asupporting en and liuidpressure assages therein, a pneumatic hammer, a purali of brackets on said supporting end an one of said bracketscommunicating with the pa es in said rod, and a valve mounted on saihammer for controlling the flow of pressure fluid through said assagesand to said hammer, said hammer ing bodily rotatable .about the axis ofsaid cylinder.

I aix my signahammer, passages in Certicate of Correction.

It is herebycertified.'thatl in Letters Patent No. 1,519,829, grantedDecember 16, 1924, upon the application of George H. Gilman, ofClaremont, New Hampshire,

for an improvement in Pneumatically-Fed Tools, verrors appear in theprinted specification requiring correction as follows: Page 3, lines 4and 5, claim 2, for the words rebent arm read .reversed end; same page,.line 6; claim 2and lines 15. 17;, and 18, claim 3, for the wordsre-bent portion read reversed emi; same page, lines 13 and 14, c1aim'3,Jfor the words refbent arm read reversed emi; same page; line 64.,4claim 8, for the Word position read piston; andthat the said LettersPatent should. be read with these corrections therein that the same mayconform to thev record ofthe case in the Patent Office. Signe@andsealedfthis 10th day of February, A. D. 1925.

[SEAL] KARL FENNING,

meting Oom/missiomr of Patents.'

